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Speech Recognizer Project API Guide
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Speech Recognizer Project API Guide
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Default parameter settings for the VAD API. More...
Macros | |
| #define | VAD_INIT_FRAMES (25) |
| Default initial smoothing filter stabilization duration in frames. More... | |
| #define | VAD_DELAY_FRAMES (13) |
| Default sequential frames above noise to declare activity. | |
| #define | VAD_ALPHA_Q15 (31128) |
| Default smoothed signal energy filter coefficient alpha (Q15). More... | |
| #define | VAD_FAST_COEF_Q15 (26214) |
| Default RMS fast activity estimator filter coefficient (Q15). More... | |
| #define | VAD_SLOW_COEF_Q15 (31129 ) |
| Default RMS slow activity estimator filter coefficient (Q15). More... | |
| #define | VAD_MIN_SIG_Q30 (603809) |
| Default signal RMS energy floor in (Q30). More... | |
| #define | VAD_MIN_NOISE_Q30 (603809) |
| Default noise RMS energy floor (Q30). More... | |
| #define | VAD_SNR_THRESHOLD_Q10 (1532) |
| Default threshold of signal above noise to assume a voice signal. More... | |
| #define | VAD_SNR_LIMIT_Q10 (4077) |
| Default ceiling above noise to limit signal. More... | |
| #define | VAD_NOISE_RATE_Q14 (16498) |
| Default noise floor maximum upward adaptation rate multiplier. More... | |
Default parameter settings for the VAD API.
| #define VAD_ALPHA_Q15 (31128) |
Default smoothed signal energy filter coefficient alpha (Q15).
The signal energy smoothing filter is
y(n) = ALPHA*y(n-1) + (1-ALPHA)*x(n)
0 < VAD_ALPHA < 32767. Default VAD_ALPHA is (0.95)
| #define VAD_FAST_COEF_Q15 (26214) |
Default RMS fast activity estimator filter coefficient (Q15).
| #define VAD_INIT_FRAMES (25) |
Default initial smoothing filter stabilization duration in frames.
| #define VAD_MIN_NOISE_Q30 (603809) |
Default noise RMS energy floor (Q30).
Noise RMS energy floor as 10^(dB/20), with a default floor value of -65 dB.
| #define VAD_MIN_SIG_Q30 (603809) |
Default signal RMS energy floor in (Q30).
Signal RMS energy floor as 10^(dB/20), with a default floor value of -65 dB.
| #define VAD_NOISE_RATE_Q14 (16498) |
Default noise floor maximum upward adaptation rate multiplier.
The noise floor maximum upward adaptation rate multiplier is set to 10^((dB/frame)/20) in Q14. The default threshold is equivalent to an increase of 3 dB/second.
| #define VAD_SLOW_COEF_Q15 (31129 ) |
Default RMS slow activity estimator filter coefficient (Q15).
| #define VAD_SNR_LIMIT_Q10 (4077) |
Default ceiling above noise to limit signal.
This setting avoids long hang times. It is a multiplier set to 10^(dB/20) in Q10. The default threshold is equivalent to 12 dB.
| #define VAD_SNR_THRESHOLD_Q10 (1532) |
Default threshold of signal above noise to assume a voice signal.
The signal above noise threshold multiplier given by 10^(dB/20) in Q10. to assume active signal. The default threshold is equivalent to 3.5 dB.